I have some strange issues with my 2007 macbook pro with the latest leopard installed. (1) A family member loaned me a hard drive that he had been using with his Macbook. For some reason I am unable to view or mount it on my macbook pro. The lights come on for 1 second then nothing. Tried it on a PC and the PC see's it fine and he has never had issues with it. (2) Now 1 week ago we purchased a different portable HD. My Macbook would see it and mount it, but would not write to it until I reformatted. (3) Picture CD's - I have had numerious people give me picture cd's that I am unable to view on the macbook. However on a PC they are fine. So in a nutshell, it seems like my macbook has an issue with formats it personally doesnt write. Any ideas? This is driving me nuts.